Key result
The presence of an R wave in lead V1 associated with a precordial transition zone at lead V3 perfectly predicted failed radiofrequency ablation of idiopathic VT from the RVOT (PPV 100%, NPV 100%).
Why the study?
What ECG characteristics predict successful radiofrequency ablation of idiopathic VT with LBBB morphology from the RVOT?
Population
35 patients with idiopathic ventricular tachycardia with a QRS morphology of left bundle branch block
Design
Cohort
Authors
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High acute success of RVOT ablation for idiopathic LBBB-morphology VT; leaves open predictors of outcome in larger studies.
Observational (n=35)
What ECG characteristics predict successful radiofrequency ablation of idiopathic VT with LBBB morphology from the RVOT?
Effect estimate: PPV 100%, NPV 100%
Absolute Event Rate: 100% vs 0%
p-value: p=0.004
ECG characteristics, specifically the presence of an R wave in V1 and a precordial transition zone at V3, can predict the failure of RVOT ablation for idiopathic VT with LBBB morphology.
Lee et al. (2002) conducted an observational in Idiopathic ventricular tachycardia with left bundle branch block morphology (n=35). Presence of an R wave in lead V1 associated with a precordial transition zone at lead V3 vs. Absence of these combined ECG features was evaluated on Failed radiofrequency ablation from the right ventricular outflow tract (PPV 100%, NPV 100%, p=0.004). The presence of an R wave in lead V1 associated with a precordial transition zone at lead V3 perfectly predicted failed radiofrequency ablation of idiopathic VT from the RVOT (PPV 100%, NPV 100%).
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